How to identify Placeholders in Vault?
Placeholders are documents without an attached source file. Many document actions are associated with source files and are not available on content placeholders, including Create Draft, Check Out, and Upload New Version.
As a placeholder does not have any source file, in the metadata of the document, the Size field would be blank. The user can navigate to the Library tab and add the Size and Binder filters as on the below screenshot to be able to identify Placeholders.
Please note that the Binder filter should be added as binders also do not have any size in Vault.